Others have probably figured this out already but you can get on top of the melenium falcon in the hoth level. Go to options and turn friendly fire off. The go up to the ship and grenade jump (through grenade at floor and jump over it as it explodes) This will take a few trys but you can get on top of the falcon. Use the same teniche to get to places you normaly cant go.

Not to surprising guys. You can be a jet trooper and fly to the top of the towers in rhen var harbor at the left lower base. You can also climb up the entire mountain on the same map with an ITT-E hover tank.

Some people are like slinkies. They're fun to push down stairs.

Te audire no possum. Musa sapientum fixa est in aure. - I can't hear you. I have a banana in my ear.

You can also climb up the entire mountain on the same map with an ITT-E hover tank.

Actually, a jet trooper can get to the top without wasting a tank. There's a particular spot you can jet to, above the cave entrance, and then just walk the rest of the way up. I used to wish I could walk up as a sniper, but the jet's pistol is so fast and accurate, with unlimited shots, I think I like it better.
(On another note.....If you take a tank to the top, and have no intention of using, please destroy it so it can re-spawn and be available to others.)

I'll have to try grenade jumping, though FF off servers are hard to come by these days. I know if I drop a grenade on the mountain I'll land on the roof of the...errrrr....enemy's main CP (forgot the name) But I never tried grenade jumping up the mountain.